Electric metal-working apparatus.



4. E. BUOHENBERG.

ELECTRIC METAL WORKING APPARATUS. APPLICATION FILED JUNE 25, 1908.

Patented Feb. 23, 1909.

2 SHEETS-SHEET 1.

INVENTOR.

A.-E. BUOHBNBERG. ELECTRIC METAL WORKING APPARATUS.

APPLIOATION FILED JUNE 25, 1908.

Patented Feb. 23, 1909.

2 SHEETS-SHEET 2.

HHHH I INVENTOR,

' letters and or ot :a S P N t me.

ALVIN BUGHENBERG, OF TOLEDO, OHIO, ASSIGN OR TO THE TOLEDO ELECTRIC WELDING COMPANY, OF TOLEDO, OHIO,

A CORPORATION OF OHIO.

i ELECTRIC METAL-WORKING APPARATUS.

To all whom z't may concern:

Be it knownthat I, A'LVIN E. BUCHEN- BERG, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Electric l\/letal-\/V0rking Apparatus; and'I do hereby declare the follow mg to be a full, clear, and exact descriptipn of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the-accompanying drawings, and to the figures of reference marked thereon, which form apart of-this specification.

.My invention relates to electric metalworking apparatus designed for use in welding, forging, upsetting,- and other operations whereinthe work is heated to the desired condition of lasticity for such purposes by the passage t erethrou h of an electric current, and has particular reference to the Work-holding or clamping means employed in apparatus of this class for holding circular er shaped articles theopposite ends of which are to be forced together for the purpose of welding. In operating on articles of this class, especially when of sufficient area in cross-section to materially effect the ilexi bility thereof, it is found that the resistance of the article to having its ends forced together causes'the workripping jaws or clamps, unlessvery powerfu to slip thereon, thus either failing entirely to force the ends which,

' the work intoabutment to make the weld or not with sufficicnt force to'effect a perfect weld. I

The object of my invention is to overcome this objectionable feature in welding the ends ofrings or similarartlcles by the provision,

in combination with the main work-clamp ing or contact parts, of auxiliary clamping parts which firmly grip the work and act to force the ends thereof together when an y slipping occurs between the main'clamping parts and the work.

The operation, construction and arran cof the invention are in ly described in the following specification and illustrated in the accompanying drawings, in

Figure 1 is a plan of an electric metal working machine embodying the features of my invention, with one set of main work clamping parts in contact with the work, and

and one clamp-operatinglever in sec- Specification of Letters Patent.

Patented Feb. 23, 1909.

Application filed une 25, 1908. Serial N 0. 440,230.

tion. Fig. 2 is a side elevation of the machine with a portion thereof in section along a portion of the line w :r in Fig. 1. larged longitudinal vertical section of a porcarrying blocks in section on t 1c line :0 a: and the parts below Fig. 1. Figs. 4 and 5 are different enlarged views of the auxiliary clamps in engagement with a portion of the work, and Fig. 6 is a diagram of the action of the clamping parts on the work.

Referring to the drawings, 1 designates a supporting frame of any suitable construction on the top 2 of which'are mounted the tables 3 and 4, which carry the work-holdin parts. One of these tables is preferably fixer to the support while the other, which is designated l in the drawing, is mounted for move- Fig. 3 is an enper or clamp I 6 in section on the line y y in ment toward and away from the contiguous end of the fixed table, as is customary in this class of a paratus. The table 3 while intended to l? machine, is preferably mounted for adjust.- ment longitudinally of the support to ada t it for operating on different sizes of work, t e adjustment thereof being effected by the turning of the right and left screw 5, which 006 crates with the table and support for sum purpose, or this adjustment may be effected in any other suitable manner. The tables 3 and 4 are guided in their respective adjusting and working movements by gibs 6. While movement may be communicated to the table 4 by any suitable means, that shown in the drawing for-such purpose com.- prises a hydraulic ack or other fluid pressure device 7 of which 7 is and 7" the change lever.

Carried at the inner end portion of each table 3, 4, in fixed relation thereto is a pedestal block 8, which from its inner edge and a shoulder or lugs 8 rising from its outer edge. ported by each of the blocks 8 is a clamp marrying block 9 the inner lower ed e of which rests on the shoulder 8 of the pedestal block while its rear or outer edge is provided with a pendent leg or shoulder 9", which slidingly rests 'on the block 8 between the shoulders 8 and 8' thereof, asshown in Figs, 2 and 3. The blocks 9 are held to their re? spective pedestal blocks .8 for movement longitudinally of the tables 3, .4 by gibs 10,

the pumping handlehas a shoulder 8 risin Movably 'sup-- which are secured to the ends of the pedestal blocks by screws 11.

1. i2 designates coiled compression springs which are disposed between the blocks 8 and 9 of each table with their opposite ends in abutment with the shoulders b and 9 of said blocks, as shown in 2 and 3, thus tendliniits of outward or rearward movements relative to their respective pedestal blocks 8, which movements are controlled by stop screws 13 carried by the lugs or shoulders.

S of the blocks 8.

Each clamp-carrying block 9 is formed with the two elevated portions which are spaced apart transversely of the direction of yielding movement of the block to permit an insert-ion of the work A therebetween, as shown. A fixed \VOl'li-Clitllli') 01' contact part 14 is mounted. in one and a movable workelamp or contact part 14 is mounted in the other of the elevated portions of each block 9 with their ends projecting within the space between such parts in position to grip the opposite faces of an interposed article A. Coacting with the outer end of each movable clamp 1d is a can't-lever 16, which is adapted when raised from its normal reclining position, which position. it seeks due to the iniluence thereon of the weight 17 or other suitable means, to force the clamp 14 toward its companion whereby to grip the work therebetween. The movable clamps 14 may be moved to open position either by the opening action of said levers or in any other suitable manner. The fixed clamps 1e are shown as being adjustably mounted within their block portions 9" due to their outer ends abutting against adjustingscrews 15, which are carried by the blocks 9.

The auxiliary. clamping means with which 1 have provided my machine comprises the two members l), 19, each of which is provided at one end with the lateral olfset por tion. 19 having the inner work-gripping surface 19" and tail-piece 1E)" and at its other end with the bearing iii", the bore of waicn is disposed in tic same. general direction as the oil'set i9)". Mounted in t -is bearing is a short shaft 20 wt ici carries at one end a camsiiaped gripping jaw ii in the plane of tize gri ping-surfacc l5)" and has its other end projecting beyond iifl bearing and fashioned. to receivea lever i audio 22. ll is thus apparent that the work when placed between the gripping-sorfacc 1S)" and cam-jaw 2] may be lirmly gripped tuercby by simply turning the cam 21 in the. proper direction for such purpose ihc members l.) are intended to be gripped to tile ring or work A on opposite sides of its ends or point to be welded and at places more remote from tie ends of the work than ti e points of cngagemcnt therewith of the respective sets of clamps 14, let, and eacn has its tail-piece 7 angle to their links 23 or out of direct axial mg toyieldingly hold the blocks 9 at their clamps or the angles thereof relative to their links. A screw 25 1s carried at tae inner side of each upright 24 for limiting ti'e lowering movement of the associated link 22 It will be noted that the set of jaws 14 i4. and the auxiliary clamping-means which engage the same end of the work clamp dill'ercnt opposing sides or faces t ereof, or in otner words, the jaws 14 14: clamp ti e front and rear sides of the end and the rippingsurfaces of tie auxiliary clamping-means clamp ti 0 upper and lower sides of suco cud, thus causing all four sides to be embraced.

26, 26 designate suitable conductors w ich connect tire clamp-carrying blocks S), S) \Vllill a transformer or other suitable source of electricity (not shown) adapted for supplying i eating-currents of large volume but of low electro-motiwi force to said blocks E), E) and tfle clamps 14, 14 carried thereby, as is customary in this class of nmcnines. Tue movable table 4 is insulated from its pedestal block is and upright 24 in a. suitable manner. as shown, to permit a closing of the circuit through the ends of the work waen broug-it in contact.

The operation of my invention is as follows: 'lhe work A being gripped lltifia'UU-ll the clamps l4, 14 of each block .i by a raising of the cam-levers H3, H3 so as to cll'ect a perfect electrical contact between the cork and said clan'ips, and the auxiliary clampingmcmbers also being 'lirmly gripped lo the work above or to the rear of the points of engagement lluire'with of ihe clamps H, H as above described, the handlc 7-" of the hydraulic-puck 7, if'snch power means is employed, is then operated to cause nil inward movement of the tablc and the parts cn.|' ried thereby for the purpose of l'orcin ihc ends of the work together Io permit llH healing-current to pass thcrcthrough .o ctl'ccl an electric nelding of such cmls. i\s llH compressing sl rcss is brougln to bear on the ori\ the resistance thereof to such sircss Ina) cause the clamps I l, H to sli in contact thercnithyanel tl ic auxiliary clamps l) lot referi-n cc to Fig. 6, which is a diagrammatical illustraion 0tv such y action. Suppose the tire vertical halves of the work A to'be 1evers which are fulcrumed as at a point I) and engaged by the clam s' -l l, 14 and the auxiliaryfclamping me'm ers 19 at the points indicated, winch-hie approximately'the relative positions oi: such parts. It r-xill now be apparent by reference to the I dotted line, which; represents the positions of such levers or halves in their compressed state, that the required distance of movement 0 of each 4 lever end or end of the work is greater by approximately the distance 6, than that of the auxiliary clamps 19, and it will be ap- 20 parentby the same reasoning that each set of clamps 14, 14 will have a greater disfame of movement than the associated auxiliary clamp 19, due to the latter being placed nearer to the fulcrum point of the engaged lever or work half than the main set of clamps. This difl'erence in movement of the auxiliary and main clamps is allowed for by the yieldingly mounting of the clampcarryin blocks 9, as this permits said blocks,

30, actuated by theclamps 14, 14, to have i11- ward movements relative to their respective pedestal blocks 8. It will thus be seen that f the clamps 14, 14 serve mainly as electrodes adapted to have close electrical'contact with the work while the auxiliary clamping members act to force the ends of the work together. I

While I have shown and described the features comprising, the gist of my invention 40 as being associated with a particular con-.

struction of machine, I wish it understood that I do not restrict the invention for use in such connection, and also that numerous changes in the construction and arrangemcnt of the parts of the invention may be made without departing from the spirit thereof.

Having thus described my invention, what I claim as new and desire to secure by Let-' tors Patent, 1s,-

1. In an electric m'etaLWorking apparatus, the combination of relatively movable sets of work contacting electrodes, and means movable ith the electrodes and cooperating there ith to grip the work, said means being capable of acting on the vork to force its ends together vhcn the electrodes slip in contact bllOl'O'r: 1th.

2. in an electric metal-fworking apparatus,' the combmatnm with relatively movable,

of v-xin-k-gripping parts, of auxiliary clamping means which automatically act to force the ork ends together when the iirst mentioned cork-gripping parts slip in com tact therewith.

3. In a machine for electrically welding together the opposite ends of articles, the combination with relatively movable sets of main work-clamping parts, of auxiliary clamping parts for acting on the work to force the ends thereof together vihen the main clamping parts slip in contact a ith the} of relative converging and retracting movemerits, and means for permitting relative movements of the separate gripping means in engagement with the same end portion of the work; 5. In a machine of the class described, two tables capable of relative eonverging and retracting movements, means for effectingsuch movements, a clamp carryingpart associated with each table, opposed work gripping members carried by each of said parts, and separate work gripping means carried by each table and adapted to 005perate with the first mentioned gripping members to force the ends of the work together when the tables have relative con verging movements. 6. In a-machine of the class described, two tables capable of relative converging and retracting movements, means for effecting such movements, work-gripping clamps carried by each table, and means carried by each table and adapted to cooperate with the gripping clamps to force the ends of the work together when the tables have relative converging movements.

. 7. In a machine of the class described, two tables capable of relative converging and retracting movements, means for efi'ecting' such movements, a block yieldingly carried by each table, 0 i osed work-gripping jaws carried by each b iock, and separate, workgripping means having link connection with each table and adapted to be attached to the work at a point more remote from the associated end thereof than the point of engagement therewith of the gripping-jaws and to cooperate with said gripping jaws to force the ends of the work together.

- 8. In a machine of the class described, the

combination of two relatively movable work:

carrying parts, a set of jaws associated with one of said parts for clamping opposed sides oi" the work, and a set of jaws associated with the same part for clamping two other 0p posed sides oi the Work than those clamped by the first mentioned jaws, substantially as described 9. In a machine of the class described, the

combination with two relatively movablec mnp-cn-i'r i' parts 01 teifles, of a set of on emh part 0? table for dimming two 01 iiie opposed sides of the Work, and a set of jaws on em-h part or table for damping tam) other opposed sides of the Work and adapted to eepemte with the first mentioned aws to force the Work ends together." when mid parts or tables have rein-Live mevemente me for ex vending around A side 01 the W'Ol'ii, eumqaw earned by sa d ofiset part for en mgmg the opposed side 05 the work to that converging 1 engaged by s i first jaw, o'gwrzhiing said .m to firmly grip thef'v 11. in & mm-hine of '11e desc the eon'lbination 0i" relativeix movable work carrying babies, :1 frame 3 art fixed relative to one m'f such tables, a iin}; pivoted to the "frame pal-b, and a Work gripping member pivotally attached to the fink and capable 2; of being attached be rings of (A e/rend diameter. In testimony wheveei 1 signed. my TMLIIIQ to tnis specifii presence of two subscribing wit have hereunto HAHN E. Nu- EERG Y. iii-116E588 (I. W. OWEN, CORNELL S 1HREIBER. 

